/Engine/Source/Runtime/Core/Public/Async/TaskGraphInterfaces.h
Sets the thread that you want to execute the null gather task on. This is useful if the thing waiting for this chain to complete is a single, named thread. CAUTION: This is only legal while executing the task associated with this event.
void SetGatherThreadForDontCompleteUntil ( [ENamedThreads::Type](API\Runtime\Core\Async\ENamedThreads__Type) InThreadToDoGatherOn )